174 



INJURIOUS AND BENEFICIAL INSECTS OF CALIFORNIA. 



Distribution.— This species, though reported in the State, 07 is not 

 at all widely distributed. 



Food Plants.— The following plants are reported as hosts: apple, 

 apricot, ash, beech, bladder nut, box-elder, cherry, cottonwood, cran- 

 berry, currant, elm, hackberry, hemlock, linden, honey-locust, water- 

 locust, maple, oak, orange, osage orange, peach, pear, plum and quince. 



Control.— Control measures are the same as for San Jose scale 

 (Aspidiotus pemiciosus Comst). 



THE LAUREL SCALE 



Aspidiotus britannicus Newstead 

 (Fig. 152) 



Description. — The scale is light 

 amber-brown with yellow exuvia 

 and is circular or somewhat elon- 

 gated. The female scale aver- 

 ages about iV inch in diameter. 

 The male scale is smaller. The 

 body is yellow. 



Life History. — The life history 

 of this scale does not differ 

 greatly from that of the perni- 

 cious or San Jose scale, except 

 that its attacks seem to be con- 

 fined almost entirely to the 

 foliage. 



Distribution. — This scale has 

 been introduced from Europe and 

 is likely to be found in orna- 

 mental plantings throughout the 

 State. It now occurs in the San 

 Francisco Bay region. 



Food Plants.— The English 

 laurel, holly and butcher's broom 

 are attacked. 



Control.— The control measures are the same as those recommended 

 for the San Jose scale. 



Fig. 152. — The laurel scale, Aspidiotus 

 britannicus Newst., on leaf of English laurel 

 or bay-tree. Slightly enlarged. (Original) 



THE CALIFORNIA PINE-LEAF SCALE 



Aspidiotus calif ornicus Coleman 98 

 (Fig. 153) 



Description.— The scale is nearly black in color and almost circular 

 or elongated, as shown in Fig. 153. The scale of the female is about 

 tV inch in diameter and the male somewhat smaller. The female body 

 is yellowish or brown. The insects settle in large numbers on the 

 needles of the pine trees. 



"Woodworth, C. W., Cal. Insects, p. 281, 1913. 



•"This scale greatly resembles Aspidiotus abietis (Schr. ), which is so common in 

 the Eastern States, but which has not been reported in California. 



